Teach the generic domains builder about SMT, and consolidate all
  architecture specific domain code into that.  Also, the SD_*_INIT macros can
  now be redefined by arch code without duplicating the entire setup code. 
  This can be done by defining ARCH_HASH_SCHED_TUNE.

  The generic builder has been simplified with the addition of a helper
  macro which will probably prove to be useful to arch specific code as well
  and should be exported if that is the case.
Signed-off-by: Nick Piggin <nickpiggin@yahoo.com.au>

From: Matthew Dobson <colpatch@us.ibm.com>

  The attached patch is against 2.6.8-rc2-mm2, and removes Nick's
  conditional definition & population of cpu_sibling_map[] in favor of my
  unconditional ones.  This does not affect how cpu_sibling_map is used, just
  gives it broader scope.

From: Nick Piggin <nickpiggin@yahoo.com.au>

  Small fix to sched-consolidate-domains.patch picked up by

From: Suresh <suresh.b.siddha@intel.com>

  another sched consolidate domains fix

From: Nick Piggin <nickpiggin@yahoo.com.au>

  Don't use cpu_sibling_map if !CONFIG_SCHED_SMT

  This one spotted by Dimitri Sivanich <sivanich@sgi.com>
Signed-off-by: Nick Piggin <nickpiggin@yahoo.com.au>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>